Which statement best describes the ventral root?

Which statement best describes the ventral root?

• A. Axons whose cell bodies reside in the ventral spinal cord gray matter
• B. Axons whose cell bodies reside in the dorsal root ganglion
• C. Interneurons in the dorsal horn
• D. Axons from the brain to muscles

Answer: (A)

The ventral root carries motor (efferent) signals from the spinal cord out to the muscles. The axons in this root come from neurons whose cell bodies are located in the ventral (anterior) part of the spinal cord's gray matter—the ventral horn. This is why the ventral root is described by neurons with cell bodies in the ventral gray matter. In contrast, sensory information enters the spinal cord through the dorsal root, where the cell bodies of the sensory neurons lie in the dorsal root ganglion, and interneurons reside in the dorsal horn to modulate sensory input. Descending motor pathways from the brain eventually synapse on the ventral horn neurons, whose axons then travel via the ventral root to reach the muscles.

The ventral root carries motor (efferent) signals from the spinal cord out to the muscles. The axons in this root come from neurons whose cell bodies are located in the ventral (anterior) part of the spinal cord's gray matter—the ventral horn. This is why the ventral root is described by neurons with cell bodies in the ventral gray matter. In contrast, sensory information enters the spinal cord through the dorsal root, where the cell bodies of the sensory neurons lie in the dorsal root ganglion, and interneurons reside in the dorsal horn to modulate sensory input. Descending motor pathways from the brain eventually synapse on the ventral horn neurons, whose axons then travel via the ventral root to reach the muscles.